General Properties
Alloy 20 is an iron-base, austenitic alloy with excellent corrosion resistance in a number of applications. When carefully compared to higher-cost alloys, Alloy 20 can be a cost-effective solution.

Applications

flue-gas desulfurization

chemical processing

food processing and storage

pharmaceutical applications

Specifications

ASTM/ASME……….. UNS N08020

DIN…………………. . 2.4660

Resistance

Alloy 20 has exceptional resistance to sulfuric acid but the alloy shows useful resistance in phosphoric acid, nitric acid as well as in chloride environments.

Alloy 20 is an excellent option when chloride stress corrosion cracking is an issue and resists pitting and crevice corrosion

Weldability

Welding Alloy 20 is commonly performed via, TIG, MIG as well as submerged arc welding (SAW) using a matching filler metal.

Heat Treatment

Alloy 20 can be formed by either hot-working or cold-work using traditional methods. Hot forged material should be heated between 2100°F and 2250°F with careful temperature control insuring that the material not fall below 1800°F prior to forging.

After hot working, anneal the material by heating to 1725°F and 1850°F for a minimum of 30 minutes per inch of thickness followed by water quench.